perf mem: Clarify load-latency in documentation
Clarify in the documentation that 'perf mem report' reports use-latency, not load/store-latency on Intel systems. This often causes confusion with users. Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1393596135-4227-2-git-send-email-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -18,6 +18,10 @@ from it, into perf.data. Perf record options are accepted and are passed through
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"perf mem -t <TYPE> report" displays the result. It invokes perf report with the
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right set of options to display a memory access profile.
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Note that on Intel systems the memory latency reported is the use-latency,
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not the pure load (or store latency). Use latency includes any pipeline
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queueing delays in addition to the memory subsystem latency.
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OPTIONS
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-------
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<command>...::
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